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Roles of chlorine in the CO hydrogenation to C2-oxygenates over Rh-Mn-Li/SiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43344 45965 2007 8 PDF Available
Title
Roles of chlorine in the CO hydrogenation to C2-oxygenates over Rh-Mn-Li/SiO2 catalysts
Abstract

Rh-Mn-Li/SiO2 catalysts were prepared by transforming nitrate and chloride precursors from one form to another stepwise, in an attempt to investigate the roles of chlorine in determining the catalytic properties of Rh-Mn-Li/SiO2. The space time yield (STY) of C2-oxygenates and CO conversion increased from 270.1 g/(kg-cat h) and 4.3% to 597.1 g/(kg-cat h) and 8.5%, respectively, and the selectivity towards C2-oxygenates increased from 65.5 to 73.6%, when the precursors of Rh, Mn and Li were completely transformed from nitrates to chlorides. The chlorine seems to function by increasing the amount of Rh species in intimate contact with Mn species and increasing the intensity of Rh–Mn interaction during reduction of the catalyst, therefore improving the Rh particle geometries, sizes and size distribution and the ratio of Rh+/Rh0 on the reduced catalyst. Such properties are responsible for the activity and selectivity towards C2-oxygenates over Rh-Mn-Li/SiO2 catalyst.

Graphical abstractThe activity and selectivity towards C2-oxygenates over Rh-Mn-Li/SiO2 catalyst obviously increased with the increase of chlorine content of dried catalyst. The chlorine seems to function by increasing the amount of Rh species in intimate contact with Mn species and increasing the intensity of Rh–Mn interaction during reduction of the catalyst, therefore improving the Rh particle geometries, sizes and size distribution and the ratio of Rh+/Rh0 on the reduced catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Nitrate and chloride precursors; Chlorine content; Rh-Mn-Li/SiO2 catalyst; C2-oxygenates; CO hydrogenation
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Roles of chlorine in the CO hydrogenation to C2-oxygenates over Rh-Mn-Li/SiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 331, 2007, Pages 70–77
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Any Questions? feel free to contact us